The Inmachuk River Placer is a gold mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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Inmachuk River Placer MRDS details
Site Name
Primary: Inmachuk River Placer
Secondary: Claim Groups: Utica
Secondary: Dashley
Secondary: Polar Bear
Secondary: Homestake
Commodity
Primary: Gold
Tertiary: Mercury
Location
State: Alaska
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1903
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: AU WORTH $18.39/OZ, PRICE OF AU = $20.67/FINE OZ, USGS BULLETIN 263, P. 209.
Materials
Ore: Gold
Gangue: Hematite
Unknown: Cinnabar
Comments
Comment (Development): SMALL-SCALE MINING, MAINLY WINTER DRIFT MINING, BELOW MOUTH OF PINNEL R. UNTIL FAIRHAVEN DITCH WAS COMPLTED IN 1908; HYDRAULIC AND OR OTHER NON-FLOAT MINING MOST YEARS BETWEEN 1908-1940; 1-2 DREDGES OPERATED: 1913-14, 1916, 1918, AND 1931-40; NO DATA ON ANY MORE RECENT ACTIVITY.
Comment (Commodity): CINNABAR PEBBLES UP TO 0.5 IN IN DIAMETER N DREDGE CONC., TDM PAM 5-R, P. 34.
Comment (Location): MOUTH OF N-TRENDING TRIB. OPPOSITE MOUTH OF PINNELL R.; PLACER MINE TAILINGS NEARLY CONTINUOUS FROM DITCH (ABOUT 1 MILE UPSTREAM) TO MOUTH OF FINK CR., A DISTANCE OF ABOUT 3 MILES. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).
Comment (Production): $400,000 - $500,000 WORTH OF AU PRODUCED, MAINLY BY WINTER DRIFT MINING, BEFORE 1908, PRICE OF AU = $20.67/FINE OZ.
Comment (Deposit): 2-7 FT OF MUCK OVER 6-8 FT OF GRAVEL; FLOODPLAIN 800-1200 FT WIDE, BEDROCK, BASAL 2-3 FT OF GRAVEL AND TOP 1 FT OF CARBONATE BEDROCK; OLD CHANNEL UNDERNEATH LAVA FLOW MINED ON N SIDE OF RIVER, OPPOSITE THE MOUTH OF PINNELL R.
Comment (Workings): MINED EXTENSIVELY; MOST OF DRAINAGE HAS BEEN DREDGED.
Comment (Geology): SOME OF THE DEPOSIT MAY BE CORRELATIVE TO KOUGAROK GRAVEL (LATE TERT. TO PLEISTOCENE) OF HOPKINS, 1963, USGS BULLETIN 1141-C. ; MAJOR.UNITS: GREENSCHIST GRADE CHLORITIC SCHIST, MARBLE, GRAPHITIC SCHIST AND QUARTZITE; LOCALLY OVERLAIN BY REMNANTS OF IMURUK LAKA BASALTIC LAVA; MORE THAN 1 MILE OF LOESS COVERS AREA. ; REG.COM: SOME AU WAS RECONCENTRATED FROM OLD CHANNEL THAT PARALLELS PINNELL R., WHERE IT CROSSES THE INMACHUK R.
Comment (Deposit): SEE ALSO: (PINNELL R.), (PERRY CR.) ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Comment (Deposit): THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.
References
Reference (Deposit): USGS BULLETIN 247, P. 58-60.
Reference (Deposit): USGS BULLETIN 263, P. 209.
Reference (Deposit): USGS BULLETIN 379, P. 355, 357-361.
Reference (Deposit): USGS BULLETIN 442, P. 367-368.
Reference (Deposit): USGS BULLETIN 792, P. 22.
Reference (Deposit): USGS BULLETIN 1141-C, P. C32.
Reference (Deposit): USBM OFR 73-75, P. 43, 48, 76.
Reference (Deposit): USGS OFR 77-796-B, P. 11, LOC. 119.
Reference (Deposit): USGS OFR 78-1-C, P. 20.
Reference (Deposit): BRISKEY, J.A., 1983, UNPUB. USGS ADMIN. REPT., P. 4.
Reference (Other Database): BAG-MF-417-71
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